JLG 500RTS Operator Manual - Manual (Page 40)

SECTION 5 - EMERGENCY PROCEDURES
5-2 – JLG Lift – 3120828
Manual Descent (Engine/Pump Failure -
Ground Controls)
The following procedure should be used to lower the plat-
form from the ground controls in the event of engine/
pump failure. Turn main power switch to on and platform/
ground select switch to ground. For battery powered
machines, position main power switch to ground. Place lift
control switch to down. When platform is completely
down, return lift control switch to center off and position
main power switch to off.
Manual Descent (Complete Loss of Power)
The manual descent valve is used, in the event of total
power failure, to lower the platform using gravity. The
manual descent handle is located on the inside of the
valve compartment on the left side of the machine. Turn
the release valve on the side of the pump to the closed
position and pump the handle. This will release the hold-
ing valve, lowering the platform. After the platform reaches
the stowed position, open the release valve on the pump.
Auxiliary Power (If Equipped) (Engine/Pump
Failure - Platform Controls)
A toggle type auxiliary power control switch is located on
the platform control station. Operation of switch turns on
the electrically driven auxiliary hydraulic pump. This
should be used in the case of failure of the main power
plant. The auxiliary pump will operate “only” the traversing
platforms. To activate auxiliary power:
1. Position IGNITION switch to off.
2. Operate appropriate control switch for desired func-
tion and hold.
3. Position AUXILIARY POWER switch to ON and hold.
4. Release AUXILIARY POWER switch and selected
control switch.
Auxiliary Power (If Equipped) (Engine/Pump
Failure - Ground Controls)
The toggle type traversing platform control switches are
located on the ground control station. Operation of switch
turns on the electrically driven auxiliary hydraulic pump.
1. Position IGNITION switch to off.
2. Operate appropriate control switch for desired tra-
versing platform function and hold.
5.4 EMERGENCY OPERATION
Use of Ground Controls
NOTICE
KNOW HOW TO USE THE GROUND CONTROLS IN AN EMER-
GENCY SITUATION.
Ground personnel must be thoroughly familiar with the
machine operating characteristics and the ground control
functions. Training should include operation of the
machine, review and understanding of this section and
hands-on operation of the controls in simulated emergen-
cies.
Operator Unable to Control Machine
If the platform operator is pinned, trapped or unable to
operate or control the machine.
1. USE THE MANUAL DESCENT SYSTEM AS FIRST
CHOICE for bringing the platform and operator
down, particularly IF THERE IS INDICATION OF
CONTROL MALFUNCTION. Further use of hydraulic
power may cause severe injury or death.
2. Operate the machine from ground controls ONLY
with the assistance of other personnel and equip-
ment (cranes, overhead hoists, etc.) as may be
required to safely remove the danger or emergency
condition.
3. Other qualified personnel on the platform may use
the platform controls. DO NOT CONTINUE OPERA-
TION IF CONTROLS DO NOT FUNCTION NOR-
MALLY.
4. Cranes, forklift trucks or other equipment which may
be available are to be used to remove platform
occupants and stabilize motion of the machine in
case machine controls are inadequate or malfunc-
tion when used.
Platform Caught Overhead
If the platform becomes jammed or snagged in overhead
structures or equipment, do not continue operation of the
machine from either the platform or the ground until the
operator and all personnel are safely moved to a secure
location. Only then should an attempt be made to free the
platform using any necessary equipment and personnel.
Do not operate controls to cause one or more wheels to
leave the ground.